Attachment for electric drills



June 2, 1931.

E. HULACK ET AL ATTACHMENT FOR ELECTRIC DRILLS 4 sheets-sheet 1 FiledApril 25, 1950 INVENToR. l Elzene Ifulacle ATTORNEY.

June

2, 1931. E. HULACK ET AL ATTACHMENT EoR ELECTRIC DRILLs Filed April 25,1930 '4 Sheets-Sheet 2 A TTORNEY.

.lune 2, 1931. E.v HULACK ET AL ATTACHMENT FOR ELECTRIC DRILLS FiledApril 25, 1930 LI'Sheet's-Sheerl 3 INI/ENTOR.

iff/Vieira@ A TTORNE Y.

June 2, 1931. E. HuLAcr ET AL ATTACHMENT FOR ELECTRIC DRILLS Filed April25, 1930 4 sheets-sheet 4 l of which an electric hand drill may bePatented June 2,11931 l UNITED STATES PATENT; 'OFFICE EUGENE HULACKl AND JOHN W. NISSROD, OF JACKSONVILLE, FLORIDA, ASSIGNORS OF ONE-SIXTH TH. E. COCHRAN AND ONE-SIXTH TO GEORGE L. RUTHERFORD, BOTH 0F iJACKSONVILLE, FLORIDA ATTACHMENT FOB ELECTRIC DRILLS Application filedApril 25, 1930. Serial No. 447,298.

This invention relates to an attachment for electric drills and has forits primary object to provide, in`a manner as hereinafter set forth, anattachment of such class by means utilized oroperating a saw blade, ile,or other reciprocating tool.

A further object of the'invention is to provide an attachment for thepurpose afore said which includes a travelling carriage for adjustablysupporting the drill, and which further includes a cam element Jforconnection with the drill chuck to reciprocate a saw blade or the like,the adjustable support for the drill permitting the saw blade to bepresented to the work with the drill disposed at various angles ofinclination with respect to the travelling carriage.

With the foregoing and other objects in View, the invention consists ofthe novel construction, combination and arrangement of parts as.hereinafter more particularly described, and as illustrated in theaccompanying drawings wherein is shown an eml bodiment of the invention,but it is to be understood that the description and draw -ings are to betaken as illustrative and that the-invention is intended to be limitedonly by the scope of the claims .hereunto appended.

In the accompanying drawings in which like numerals are employed todesignate like parts throughout the several views Figure 1 is a sideelevation of an electric hand drill showing an embodiment of ourinvention associated therewith.

Figure 2' is a front elevation thereof.

Figure 3 is a section taken on the line 3-3 of Figure 1.

Figure 4 is a section taken on the line 4 -4 of Figure 3. Figure 5 is asection taken on the line 5 5 of Figure 3. y

Figure 6 is a transverse section taken at a point -indicated by the line6-6 of Figure 1.

Figure 7 is a section taken at a point indicated by the line 7-7 ofFigure 4.

Figure 8 is a motor housing o the drill. v

Figure 9 is an elevation of a combined support and guide secured to theshaft housing of the drill.

Figure 10 is an elevation of a slide carried by the element shown inFigure 9.

Figure 1-1 is a section taken at a point indicated by the line 11-11 ofFigure 4'.

Referring to the drawings in detail, the numeral indicates generally anelectric hand drill provided with the usual chuck 2 for connection witha drill bit, not shown. The attachment consists of a travelling carriage3 which is in the form of an elongated plate .having marginal portionsthereof bent in a manner to provide channels 4 in the lower face of thecarriage adjacent the side edges thereof. Disposed within the channels 4are a plurality of rollers 5 which are l adapted to have rolling contactwith the work, and which are rotatably supported within the channels bymeans of suitable shafts 6 extending through the Side walls of thechannels. At the foreward end thereof the carriage is provided with arecess 7 which is disposed between the channels 4 and which tapers in arearward direction. Extending around the wall of the recess 7 is anupstanding Bange 8.

Rearwardly of the recess 7, the carriage is formed with a transverselyextending, vertically disposed plate 9 which is formed with an upwardlyarched central portion 10. Pivotally connected to the rear face of theplate 9 by means of an adjustable bolt 11 is a supporting member 12which is formed on its forward face with a shoulder13 for engagementwith the upper face of the central portion lO of the plate 9. Thesupporting member 12 .terminates at its upper end in an enlarged head 14which is apertured transversely of the carriage for the receptiontherethrough of a pin 15 for pivotally connecting with the supportingmember 12 a combined support and gulde element indicated generally at16.

The element 16 includes a clamp 17 for embracing theshaft housing 18 ofthe drill,

- the clamp. merging in a plate 19 which ex- JIplan of the clamp for thetends in parallel relation to the housing 18 l end 1 which is providedwith formed throughout a portion of its length with a pair ofstrengthening flanges 20. lFormed integrally with the plate 19, inspaced relation to the lower end thereof, is a right angularly disposedsupporting member 21 which is provided With spaced depending Webs 22also formed integrally with the plate. The head 14 of the supportingmember 12 extends between the webs 22 and the latter are apertured forthe reception of the pin 15 therethrough. The supporting member21 isrecessed in im upper face for the reception of a bearing assembly 22carried by a stud 24 projecting from the lower of a cam roller 25,the-upper end of a shank 26 for enga ement by the chuck 2 of the drill.

ecured to the motor housing 27 of the drill is a clamp indicatedgenerally at 28 and including a pair of oppositely dlsposed arcuateportions 29 embracing the housing 27. At the forward side of the housing27, the arcuate portions 29 terminate in lugs 30 arranged in parallelrelation and adapted to receive therethrough a bolt 31 which is providedwith a wing nut 32. At the rearward side of the housing 2-7, the arcuateportions 29 merge into arcuate extensions 33 which are maintained inspaced relation by a suitable holdfast device 34 located adjacent thearcuate portions 29. Projecting between lower end portions of theextensions 33 is the upper end of an arcuate bracket 35, the lower endof which is pivotally connected to a lug 36 projecting upwardly from thecarriage 3. The bracket 35 is pivotally connected to the lug 36 by meansof a suitable bolt 37 which extends longitudinally of the carriage. Thebracket 35 1s formed with an elongated slot 38 through which a bolt 39extends. The bolt 39 further extends through openings provided adjacentthe lower ends of the extensions 33 and is provided with a wing nut 40.

The plate 19 of the support and guide element 16 is formed in itsforward face with a dove-tailed groove 41 within which is disposed aslide 42. The slide 42 is provided on its forward face with a pair ofspaced ribs 43 which are formed with apertures for the extensiontherethrough of bolts 44. The

ribs 43 are adapted to receive therebetween the base portion of areciprocating tool, such as a saw blade 45, the tool being ixedlyconnected with the slide by means of the bolts 44. Projecting from therear face of v the slide 42, adjacent the ripper end of the latter, is astud 46 which is provided with a Aroller 47 /extending within andengaging the side walls of a diagonally disposed groove 48 formed in theperipheral face of the cam roller 25. The stud 46 extends looselythrough a slot 49 formed in the plate N In the operation of theattachment, the

cam roller 25 is rotated by the chuck 2, and owing to the' engagement oftheJ roller 47 with the Vside walls of the roove 48, the saw blade isreciprocate during each revolution of the cam roller. As the blade 45cuts through the work, as indicated at 50, the carriage 3 is moved inthe direction of the cut. By loosening the wing nut 40, the drill,together with the support and guide 16 may be swung about the pivot 15as indicated in Figurel by dotted lines. In the dotted line showing inFigure l, the tool 45 is shown reversed with respect to the slide 42whereby the teeth of thetool are disposed on the forward face thereof.By loosening the bolts 11 and 37, the entire attachment .with theexception of the carriage 3 may be swung sidewise as indicated by dottedlines in Figure 2. In order'that thc drill may be accurately positionedat a lateral inclination, the rear face ol the central p0rtion 10 of theplate 9 is calibrated as indicated at 51. The supporting member 12 isprovided with a peep hole 52 through which the calibrations 51 arevisible. In order that the attachment may be more conveniently handled,an auxiliary handle member 53 is provided, such handle member beingsecured in position by the bolt 37. In order to hold the carriage 3level when the drill is tilted sidewise, a removable counter weight 54may be seated on the carriage as indicated in Figures 3 and 7.

It is thought that the many advantages of an attachment in accordancewith this invention will be readily apparent, and although the preferredembodiment of the invention is as illustrated and described, it is to beunderstood that changes in the details of construction may be resort-cdto, so long as such changes fall within the scope ofthe invention asdefined What we claim is:

1. In an attachment for connection with the rotatable chuck of anelectric hand drill, a cam roller having a shank for engagement by thechuck, said cam roller having its peripheral face formed with adiagonally disposed groove, a guide element adjacent the cam roller,slidably mounted in the guide element, a roller carried by the toolconnecting element and extending into said groove, a travelling carriagefor engagement with an object to be operated upon, a vertically disposedplate extending transversely of the carriage; a

v'supporting member having its lower end Vpivotally connected with saidplate to swing a tool connecting element in the appended claims.

on an axis llongitudinally of the carriage,

said guide element having a tion pivotally connected with the upper endof said supporting member to swing on an axis disposed transversely ofthe carriage,

and adjustable means for preventing movement of the guide elementrelative to said projecting por- 'supporting member, said adjustablemeans Vand extending through said elongated slot.

2. In an attachment for connection With the rotatable chuck of anelectrichand drill, a cam roller having a shank for engagement by thechuck, said cam roller having its peripheral face formed with adiagonallydisposed groove, al guide element adjacent` the cam roller, atool connecting element slidably mounted in the guide element, a rollercarried by the tool connecting element and extending lnto said groove, atravelling carriage for engagement with an object to be operated upon, avertically disposed plate extending transversely of the carriage, saidplate having an arched central portion, a supporting member pivotallyconnected to said plate to swing o n an axis extending longitudinally ofthe carriage, said supporting member havin upper face of sai said guideelement having a projection pivotally connected witlt/said supportingmember to swing on an axis transversely of the carriage, and means forpreventing swingingmovement of the guide element and supporting memberwith respect to the carriage.

3. In an attachment for connection with a shoul -er riding on the therotatable chuck of an electric hand drill,

- ing member havin a cam roller having a shank for enga ement by thechuck, said cam roller having its peripheral face formed with adiagonally disposed'groove, a guide-element adjacent the cam roller, atoolA connecting element slidably mounted in thel guide element, aroller carried by the tool connecting element and extending 1nto saidgroove, a travelling carriage for engagement with an object to beoperated upon, a vertically disposed plate extending transversely of thecarriage, said platehaving an arched central portion, a supportingmember pivotally connected to said plate to swing on an .axis extendinglongitudinally of the carria e, said supporta shoul er riding on theupper face of sai arched central portion, said guide element having? aprojection pivarched central portion,`

vided with a peep hole through which said calibrated face is visible.

4. In an attachment for an electric drill, a travelling carriage foradjustably suporting the drill, sa1d carriage being in the orm of anelon ated plate having marginal ortions tliereo bent to provide thelower ace of the plate with a pair of spaced channels, a plurality 'ofrollers rotatably mounted within the channels and depending below thewalls thereof, an apertured lug projecting upwardly `from the plate, anda vertically disposed plate extendin transversely of the carriage inspaced re ation to said lug.

5. In an attachment for an electric drill, a travelling carriage foradjustably suporting the drill, said carriage being in the orm of anelongated plate having marginal portions thereof bent to provide thelower face of the plate with a pair of spaced channels, a pluralit ofrollers rotatably mounted within the c annels and depending below theWalls thereof, an apertured lug projecting upwardly from Kthe plate, anda vertlcally disposed plate extending transversely of the carriage inspaced relation to said lug, said vertically disposed plate having anupwardly arched central portion .provided with a calibrated face.

6. In an attachment for an electric drill, a combined guide and sup)o1-ting element, said elelnent including a c amp for encircling thedrill, an elongated plate formed integrally with the clamp, a supportingmember projecting from the plate at a right angle, thereto, and a pairof aperlured, spaced webs depending from the supporting member.

7. yIn an attachment for an electric drill, a combined guide andsupportin element, said element including a c amp or encircling thedrill, an elongated plate formed integrally with the clamp, a supportingmember projecting from the plato ata right angle thereto and a air ofapertured, spaced webs depending Jdiem the supporting. member, said elonated plate being formed with an elongate( slot and further being formedin its forward face with la dovetailed groove'.

In testimony whereof, we aix our signa;-

otally connected with said supporting'member to swing on an axistransversely of Ythe carriage, and means for preventing swingf ingmovement of the guide element and supporting member with respect to thecarriage, said arched central portion of the transversely extendingplate having a calibrated face, L said supporting member being pro-

